package com.mgq.netty.c6;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import lombok.extern.slf4j.Slf4j;

/**
 * InboundHandler: 入站规则
 * OutboundHandler: 出站规则
 */
@Slf4j
public class TestNettyPipeline {
    public static void main(String[] args) {
        new ServerBootstrap().group(new NioEventLoopGroup())
                .channel(NioServerSocketChannel.class)
                .childHandler(new ChannelInitializer<NioSocketChannel>() {
                    @Override
                    protected void initChannel(NioSocketChannel ch) throws Exception {
                        //handler是一个双向链表,netty默认会加head和tail
                        // head->h1->h2->h3->h4->h5->h6->tail
                        // head<-h1<-h2<-h3<-h4<-h5<-h6<-tail
                        // 入站执行顺序是h1->h2->h3
                        // 入站执行顺序是h6->h5->h4
                        // channel.writeAndFlush()和ctx.writeAndFlush()区别
                        //channel执行完后,会返回到tail,然后从tail往前找出站Handler
                        //ctx执行完后,是从当前往前找出站Handler
                        ChannelPipeline pipeline = ch.pipeline();
                        pipeline.addLast("h1", new ChannelInboundHandlerAdapter() {
                            @Override
                            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                log.debug("1");
                                super.channelRead(ctx, msg);
                            }
                        });
                        pipeline.addLast("h2", new ChannelInboundHandlerAdapter() {
                            @Override
                            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                log.debug("2");
                                super.channelRead(ctx, msg);
                            }
                        });
                        pipeline.addLast("h4", new ChannelOutboundHandlerAdapter() {
                            @Override
                            public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
                                log.debug("4");
                                super.write(ctx, msg, promise);
                            }
                        });
                        pipeline.addLast("h3", new ChannelInboundHandlerAdapter() {
                            @Override
                            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                log.debug("3");
                                ctx.writeAndFlush("server.........");
                                super.channelRead(ctx, msg);
                            }
                        });
                        pipeline.addLast("h5", new ChannelOutboundHandlerAdapter() {
                            @Override
                            public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
                                log.debug("5");
                                super.write(ctx, msg, promise);
                            }
                        });
                        pipeline.addLast("h6", new ChannelOutboundHandlerAdapter() {
                            @Override
                            public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
                                log.debug("6");
                                super.write(ctx, msg, promise);
                            }
                        });
                    }
                })
                .bind(8080);
    }
}
